Using Ajax to access Ruby HTTP server - ruby

Question

I wrote a very simple HTTP server at my PC by ruby. I can access the it from IE/FF/Chrome and display the result XML correctly, however when I tried to access it by a Jquery AJAX call, looks like it only got the header of the response. Anyone can help?
the code of ruby
server = TCPServer.new('localhost', 9000)
loop {
client = server.accept()
while((x = client.gets) != "\r\n")
puts x
end
$result= "<root><data>123</data></root>"
headers = ["HTTP/1.1 200 OK",
"Date: Tue, 14 Dec 2010 10:48:45 GMT",
"Server: Ruby",
"Content-Type: text/xml;charset=gb2312",
"Content-Length: #{$result.bytesize}\r\n\r\n"].join("\r\n")
client.puts headers
client.puts $result
client.close
puts "Request Handled"
and the jquery code
$(document).ready(function(){
$("#btn").click(function(){
$.ajax({
url:"http://localhost:9000",
type:"GET",
dataType:"xml",
async:true,
timeout: 2000,
error: function(xml, status, err){
alert('Error loading XML document'+xml+status+err);
},
success: function(xml){
$(xml).find("data").each(function(i){
alert($(this).text());
});
}
});
});
});
ok, I got the reason. AJAX should only access the URL in the same domain. I put the AJAX code in a local HTML, hence can't access the server.
updated server code as below, and put the AJAX html under "/", the access point it "http:/ /localhost : 9000/ajax.html"
require 'webrick'
$mydata="<root><data>test1</data><data>test2</data></root>"
class MyServlet < WEBrick::HTTPServlet::AbstractServlet
def do_GET(request, response)
response.status = 200
response.content_type = "text/xml"
response.body = $mydata
end
end
server = WEBrick::HTTPServer.new(:Port => 9000,:DocumentRoot=>Dir::pwd)
server.mount "/data", MyServlet
trap("INT"){ server.shutdown }
server.start